export function love () {
  (function (window, document) {
    var hearts = []
    window.requestAnimationFrame = (function () {
      return window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        function (callback) {
          setTimeout(callback, 1000 / 60)
        }
    })()
    init()
    function init () {
      css(".heart{width: 10px;height: 10px;position: fixed;background: #f00;transform: rotate(45deg);-webkit-transform: rotate(45deg);-moz-transform: rotate(45deg);}.heart:after,.heart:before{content: '';width: inherit;height: inherit;background: inherit;border-radius: 50%;-webkit-border-radius: 50%;-moz-border-radius: 50%;position: absolute;}.heart:after{top: -5px;}.heart:before{left: -5px;}")
      attachEvent()
      gameloop()
    }
    function gameloop () {
      for (var i = 0; i < hearts.length; i++) {
        if (hearts[i].alpha <= 0) {
          document.body.removeChild(hearts[i].el)
          hearts.splice(i, 1)
          continue
        }
        hearts[i].y--
        hearts[i].scale += 0.004
        hearts[i].alpha -= 0.013
        hearts[i].el.style.cssText = 'left:' + hearts[i].x + 'px;top:' + hearts[i].y + 'px;opacity:' + hearts[i].alpha + ';transform:scale(' + hearts[i].scale + ',' + hearts[i].scale + ') rotate(45deg);background:' + hearts[i].color
      }
      requestAnimationFrame(gameloop)
    }
    function attachEvent () {
      var old = typeof window.onclick === 'function' && window.onclick
      window.onclick = function (event) {
        old && old()
        createHeart(event)
      }
    }
    function createHeart (event) {
      var d = document.createElement('div')
      d.className = 'heart'
      hearts.push({
        el: d,
        x: event.clientX - 5,
        y: event.clientY - 5,
        scale: 1,
        alpha: 1,
        color: randomColor()
      })
      document.body.appendChild(d)
    }
    function css (css) {
      var style = document.createElement('style')
      style.type = 'text/css'
      try {
        style.appendChild(document.createTextNode(css))
      } catch (ex) {
        style.styleSheet.cssText = css
      }
      document.getElementsByTagName('head')[0].appendChild(style)
    }
    function randomColor () {
      return 'rgb(' + (~~(Math.random() * 255)) + ',' + (~~(Math.random() * 255)) + ',' + (~~(Math.random() * 255)) + ')'
    }
  })(window, document)
}